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SOME THOUGHTS ON COHERENT STRUCTURES OF TURBULENCE

1992, 22(3): 289-309. doi: 10.6052/1000-0992-1992-3-J1992-030

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In this paper the trends in the study on the coherent structure of turbulent shear flows are discussed with a brief review of the achievements in this area during the last thirty years. It is shown that the accurate database of turbulent fluctuations plays a significant role in the quantitative investigation of the structure patterns. It is emphasized that the study on the dynamics of the coherent structures is the main target today. Some comments are made on the present views of the dynamics, e.g., flow in...

TWO KINDS OF LAMINAR FLOW IN POLYMER SOLUTIONS AND MECHANISM OF DRAG REDUCTION

1992, 22(3): 310-317. doi: 10.6052/1000-0992-1992-3-J1992-031

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A brief review on the research work of drag reduction of dilutepolymer solutions is given in this paper. The new idea about polymer laminar flow and the mechanism of drag reduction based on the idea proposed by Harvard group are summarized systematically.

ON NUMERICAL SIMULATIONS OF SUPERSONIC AND HYPERSONIC INLET

1992, 22(3): 318-323. doi: 10.6052/1000-0992-1992-3-J1992-032

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The paper systematically reviews the advances in fluid mechanics ofsupersonic and hypersonic inlet, its development and state of arts both at home and abroad, and the research on numerical simulations in China. Some suggestions are made with respect to advancing development of numerical simulations in China.

A FREE-PISTON SHOCK TUNNEL

1992, 22(3): 324-331. doi: 10.6052/1000-0992-1992-3-J1992-033

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One of the high-enthalpy intermittent wind tunnels is the free-pistonshock tunnel, where a free heavy piston compressor is used. It is first suggested and built by Prof. R. J.Stalker at the Australian National University, Canberra, Australia. The free-piston shock tunnel is unique in its ability to provide very-high-temperature, high-pressure test conditions, and can be used to produce test section flows with stagnation enthalpies greater than those corresponding to earth satellite velocity, so this type of...

PROGRESS IN TORSION THEORY RESEARCH FOR CONCRETE STRUCTURES

1992, 22(3): 332-346. doi: 10.6052/1000-0992-1992-3-J1992-034

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The paper reviews historical development of torsion theory research for concrete structures both at home and abroad, especially, its development in the last ten years.Skew bending theory and space truss theory are discussed briefly in the paper. The paper summarizes the torsional calculating methods for plain, reinforced and prestressed concrete structures according to different loadings: (1) pure torsion; (2) torsion combined with bending; (3) torsion combined with bending and shear.Finally, some proposals...

1992, 22(3): 346-346. doi: 10.6052/1000-0992-1992-3-J1992-035

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THE PRESENT SITUATION AND THE TENDENCY OF THE RESEARCH ON ELASTOPLASTIC WAVES

1992, 22(3): 347-357. doi: 10.6052/1000-0992-1992-3-J1992-036

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The research on elastoplastic waves is reviewed in this paper, andsome important topics in the theoretical research on elastoplastic waves and therelated engineering fields are discussed. The tendency of the research on this field is outlined.

CURRENT STATUS AND PERSPECTIVE ON MICROGRAVITY RESEARCH AND USERS SUPPORT IN EUROPE

1992, 22(3): 358-366. doi: 10.6052/1000-0992-1992-3-J1992-037

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This paper reviews the major research and user support activities performed in Europe in the fields of microgravity Materials, Fluids and Life Sciences. Starting from a brief historical introduction, the major European missions are analysed, the future developments depicted with a special emphasis on the European long term scientific goals. The concept of ground based research is introduced and the ground facilities (i.e. drop towers, parabolic flights, sounding rockets) used are analysed. Furthermore, a sp...

1992, 22(3): 367-380. doi: 10.6052/1000-0992-1992-3-J1992-038

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1992, 22(3): 381-394. doi: 10.6052/1000-0992-1992-3-J1992-039

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1992, 22(3): 395-418. doi: 10.6052/1000-0992-1992-3-J1992-040

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1992, 22(3): 419-425. doi: 10.6052/1000-0992-1992-3-J1992-041

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1992, 22(3): 426-426. doi: 10.6052/1000-0992-1992-3-J1992-042

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1992 Vol. 22, No. 3

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